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Name ______________________ per____ date ________ mailbox __________

THE PERIODIC TABLE – note: atomic weight in the article is the same as atomic mass from class.

1. Everything that is naturally occurring on Earth is made up only of this number of elements?

_______________

2. The basic components of all elements, are made up of atoms. The three basic particles that make

up all atoms are ______________, ______________ and ______________.

3. When scientists first tried to describe the physical and chemical properties of the elements and

chemical compounds, which are formed by the combination of atoms of different elements, they

soon become buried under a bewildering array of complex combinations and seemingly unconnected

facts. The need to organize all this information, data and facts arose. The solution was:

A. Filing systems C. Scientific collaboration

B. The Periodic Table D. Museums

4. How did Dmitry Mendeleyev arrange elements on the Periodic Table?

A. Not until the 20th Century (1900-2000), were we able to accurately construct any of the

Periodic Table.

B. Mendeleyev was able to predict chemical properties of elements that had not even been

discovered yet, by arranging elements based on known properties like atomic mass.

C. Mendeleyev’s contributions were over shadowed by Julius Meyer and forgotten to history.

D. Meyer and Mendeleyevs’ elemental arrangements were completely incorrect.

THE NUCLEAR ATOM

5. “Atom” is actually a Greek word meaning _____________________?

A. Divisible C. Divided

B. Indivisible D. United

6. Matching (write # on line)

___Thompson 1- developed periodic tables in 1869 independently of one another

___Mendeleyev & Meyer 2- discovers the electron in 1897 at Cambridge University,

England

___Mosely 3- New Zealand physicist discovers nucleus and protons 1911

___Chadwick 4- discovers the neutron, 1932 also at Cambridge University,

England

___Rutherford 5- discovered that all elements have a different number of

protons and distinct X-ray patterns, just prior to WW I which

confirmed Mendeleyev’s work.

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7. Mosely was able to relate the properties of X-rays to the number of protons contained in an

element. This came to be known, as the atomic number and is always reported as a whole number,

not a decimal, like atomic weight (mass). He discovered that the number of protons was

_____________________.

A. just another part of the atom’s nucleus

B. a type of x-ray

C. unique to the individual element and therefore a key identifier and collaborator of

Mendeleyev’s Periodic Table

D. insignificant to element properties

Fill in the blank:

8. Atoms are normally ______________________ neutral, with an equal number of electrons and

______________. This means for example, that carbon, with an atomic number of ___, has six

protons in its nucleus and six electrons outside the nucleus.

ISOTOPES

Define:

____________________________________________________________________________

____________________________________________________________________________

________________________________

Ex:

____________________________________________________________________________

9. Mosely’s findings demonstrated that it was __________________ and not

_________________ that determined or distinguished one element from another.

A. atomic weight and not atomic mass

B. neutrons and not electrons

C. isotopes and not atoms

D. atomic number and not atomic mass

10. What distinguishes one isotope from another such as in the three species of hydrogen; protium,

deuterium and tritium is _____________________.

A. Proton count

B. Electron count

C. Atom size

D. Neutron count

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11. Why is it that the atomic weight (mass) is often not a whole number, but rather a decimal?

A. Because it is actually an average of several or all of the naturally occurring isotopes of an

element

B. Trick question, the atomic weight is always a whole number

C. Wait trick choice, isn’t the atomic mass always an average

D. Huh?

THE MODERN PERIODIC TABLE

Fill in the blank:

12. The modern statement of the periodic law is that the __________________ and

__________________ properties of the elements vary in a periodic way with their atomic

numbers.

Word bank fill in the blank: properties, groups, periods, Mendeleyev,

atomic number, periodic, electric forces

13. The modern periodic table is arranged very much like ____________________________table.

14. The elements are arranged in rows called _________.

15. In each period, the elements are arranged by order of _____________.

16. The vertical columns of the periodic table are also called ___________.

17. All the elements within a group have similar chemical _______________.

18. The elements on the Periodic Table are arranged in this manner because they have repeating

predictable _____________ chemical and physical properties that they share.

19. Atoms are attracted to one another by ________________.

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20. What causes this periodic behavior of the elements? Why do the elements within a particular

group have similar chemical behavior?

Atoms are attracted to one another by electrical _____________

The number of protons ultimately determines how many

___________________________________

Electrons in turn ultimately determine how atoms

_________________________________________

Thus, the chemical behavior of an element is

______________________________________________________________________

_________________________________________________________

21. Quantum Theory “the gist” -

_______________________________________________________________

____________________________________________________________________________

____________________________________________________________________________

____________________________________________________________________________

__________________________________________

The duality -

____________________________________________________________________________

____________________________________________________________________________

_________________

22. Elements in the same group in the periodic table have the same number of electrons in their outer

shells.

This causes them to have _______________________________

A. the same valence electron configuration and thus similar chemical reactivity.

B. distinct proton formations

C. different properties

D. multiple atom arrangements

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